Question about Heating & Cooling

2 Answers

Gravity feed boiler/ american standard model#g27dpgc

This is a really old boiler and I would like to know why is the pressure relief valve keep discharging water? I replaced the expansion tank and the pressure relief valve and it is still discharging water.. The only thing that I did was see if the pressure relief valve was working, after that I was unable to keep the make up water on, so now I just go down stairs everyday to make sure the boiler has enough water..

Posted by on

Ad

2 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 3 Answers

Your make up water pressure is greater than the safety relief pressure. The safety should be 30psi lift. the makup usually goes through a regulator called an automatic makeup valve. these valves operate infrequently on a closed system and get rusty. They stick. If yours is stuck open, then your makeup water pressure which is probably greater than 30psi is overpressuring your boiler.

Posted on Sep 30, 2008

Ad
  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Expert
  • 86 Answers

Change valve

Posted on Mar 17, 2008

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My boiler has a squeeling sound during the warmu up. I think it is coming from the expansion tank?


The squealing sound generally comes from a circulator pump, if it has a drive coupling between motor and impeller housing there is an oil cup/or oil hole, add oil until it is full! If it is a cartridge style circulator you may have to replace it.

Sometimes air in a system will cause this squeal noise as well. Purging the air out of system may be required. If you need to know how to purge a system there is a good pdf file at this link for $8.95 The Basics of Purging Air
From your Forced Hot Water System
&
Troubleshooting A Leaking Boiler
Relief Valve
Miller Furnace Books Repair

The Expansion tank is factory set to 12 psi and the only way to tell if it remains with 12 psi is to drop the system pressure to zero and check the tank with a pressure gauge. If water comes out the air valvestem when you apply the pressure gauge, the tank is bad, replace it! If there is less then 12 psi on the tank add air to 12 psi and open water valves back up to normal operating pressure. Usually the feed valve will automatically stop at the preset setting.If the boiler is leaking water out any relieve valve drains, the feed valve, relief valve and or expansion tank may need to be replaced.

Oct 09, 2014 | Amtrol EX-30 Diaphragm Expansion Tank...

1 Answer

Safety relief valves


Need to know what pressure steam you are running, and what your water feed pressure is & temperature. If you are using a deaerator with pumps to supply feed pressure, and if there is a stack economizer. @ your altitude, I would de-rate your gas output to 10% less than your rated BTU's. Also need to know the % of oxygen in your flue gas, and if the gas & air intake is staged or modulating.

Apr 17, 2013 | Weil-McLain 88 Series - 11.8 GPH -...

1 Answer

When boiler heats water the pressure increases to the point that the pressure relief valve( 30 psi) releases water from the system.What causes the pressure to increase? The system includes an expansion...


You did not mention what pressure the boiler displays when not on. It should be between 12 and 15 psi. You could have a bad feed valve, bad expantion tank (tap lower 1/2 to see if hollow).

Mar 15, 2011 | Heating & Cooling

1 Answer

My relief valve slowly drips when my boiler runs, fills up a 5 gallon bucket in a day, when it runs alot. this is new ,


Is the pressure in the boiler higher than the set pressure of the relief valve? If it is, there is a problem that the relief valve is trying to correct.
If not, did you try making the valve open?
Be careful, but step back, lift the lever and briefly let the relief valve discharge into a bucket of some sort, maybe you could put some old rags in it to keep from spraying out at you. If there is sediment in the valve this may flush it out.

Dec 06, 2010 | Watts 3/4 Pressure Relief Valve

2 Answers

My f28 boiler is letting water out all the from the run off valve


Hello

This is a relief vave,probably rated for 30 psi.You either have air in your heating system causing the pressure to go up.

Or you need a new relief valve,sometimes the springs wareout or rust and iron from the water keep them from reseating properly.

You should have 15 to 20 psi of pressure on the boiler if its 30 or over you need to bleed air from the highest radiator or baseboard,if there is a 2nd floor go up to one and find the bleeder and bleed out air.Be carefull once the water starts coming it will be hot.

Nov 08, 2010 | Heating & Cooling

2 Answers

My pressure relief valve opens, why? I have an American Std boiler Mod# GPMX8. My pressure valve was leaking and boiler was operating at 16psi. After replacing the pressure valve. I refilled boiler and was...


if you have a captive air expansion tank its most likely bad and leaking inside. means the rubber bladder leaked internally. cheap money and easy to replace. do not even try to test the air pressure in an old one. or try to refill it. replace it. good luck

Jul 02, 2017 | American Standard 2770.018w.020 Cadet...

1 Answer

Boiler pressure


If there is no leak anywhere in the system [pipes & radiators] Check the emergency pressure relief valve. It usually is at the base of the boiler and drains to outside [15mm pipe] where, if the valve leaks, water drips can be seen.. Looks similar to the picture with your query
Renew the valve
You can take it apart and clean it but I've never found that to be successful in the long term

Dec 29, 2009 | Watts 3/4 Pressure Relief Valve

1 Answer

Boiler leak


Hi, it appears you have a defected relief valve. you can try one solution. lift the handle on the relief valve and let some water out. sometimes that can flush out materials thats blocking the stem in the valve. if it's still leaking it must be replace.

If this doesn’t work for you please write back. Thanks,

Nov 23, 2008 | Watts 3/4 Pressure Relief Valve

1 Answer

I have a ideal mini c24 cobi boiler and it isnt holding pressure the are no leaks inside the house it just seems to be releasing the water for the central heating from the blow off pipe outside so i keep...


So the boiler relief valve is leaking? What is the boiler pressure when the relief valve leaks? The relief valve will have a pressure rating on it. If the relief valve leaks when the pressure in the boiler is lower than the relief valve setting then its just a bad relief valve. If the relief valve is leaking when the boiler pressure gets above the relief valve pressure setting then the relief valve is doing its job and there is another problem. Several things can cause the boilers pressure to go higher than the relief valves setting. It could be a bad expansion tank or one that needs to be drained and re-charged. It could be a bad cold water fill valve that isn't shutting off and is over filling the system, rasing the pressure above the relief valve setting. If this boiler also does your domestic hot water, I have seen where the domestic hot waters heat exchanger has a hole in it and the domestic hot water is mixing with the boilers water and over pressuring the boiler.

Jan 13, 2018 | Heating & Cooling

1 Answer

Hydronic Boiler relief valve problem?


Check the pressure guage. Typically the pressure in a water boiler should not be more than 20 psi. If you are approaching 30, the relief valve is doing it's job. I would replace or adjust the automatic water feed if the pressure is high. Always replace the boiler relief valve. Tap on the expansion tank, it should sound hollow. Replace it if it is full of water. If you have one of the old expansion tank that has no bladder in it, drain it.

Dec 03, 2007 | Heating & Cooling

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

495 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts

Paul Carew

Level 3 Expert

3238 Answers

Dan Webster
Dan Webster

Level 3 Expert

8220 Answers

Tim Whalen

Level 3 Expert

3074 Answers

Are you a Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...